He has observed, for example, that some of his friends at his swimming club he swims to stay in shape have become obsessed with their technique and its contribution to speed and faster times.

NEWYORKER: Master of Play

At 61, he runs or swims almost every day.

ECONOMIST: Mitch Daniels

The pool workouts Jones does are intense: He described a drill called "dive and swims" in which he will do eight sets of 200 meters, pulling himself out of pool at the end of each length, and diving right back in.

WSJ: Jon Jones: A Formidable UFC Champ in a Forbidden City